The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists最新文献

Conversions between SI and CGS units for rock magnetism 岩石磁性的SI和CGS单位之间的转换

The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists Pub Date : 1987-12-05 DOI: 10.2465/GANKO1941.82.441

H. Ueno

引用次数: 2

Age of formation for the Ishikawa composite mass, Abukuma mountains, inferred from Nd and Sr isotopic systematics 由Nd和Sr同位素系统推断的武间山石川复合岩体的形成年代

The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists Pub Date : 1987-12-05 DOI: 10.2465/GANKO1941.82.433

K. Shibata, Tsuyoshi Tanaka

引用次数: 21

Petrology of an epizonal gabbroic suite: the Batow pluton, Yamizo Mountains, Central Japan 一层长辉长岩套的岩石学:日本中部山三山Batow岩体

The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists Pub Date : 1987-12-05 DOI: 10.2465/GANKO1941.82.419

Hisao Tanaka, Chung Huang, Youichi Nakamura, E. Kurokawa, Masahiro Nobusaka

{"title":"Petrology of an epizonal gabbroic suite: the Batow pluton, Yamizo Mountains, Central Japan","authors":"Hisao Tanaka, Chung Huang, Youichi Nakamura, E. Kurokawa, Masahiro Nobusaka","doi":"10.2465/GANKO1941.82.419","DOIUrl":"https://doi.org/10.2465/GANKO1941.82.419","url":null,"abstract":"The Batow pluton, an epizonal gabbroic body, Central Japan, was studied to delineate its geologic, petrographic and geochemical characteristics. Though the pluton is small, it exhibits a wide compositional range from melagabbro to granodiorite and varies from 42.8 to 62.7 wt.% SiO2. The Batow rocks have similar features to calc-alkaline, magnetite-series and I-type plutonic rocks and are characterized by high abundances of lithophile elements, comparable to those in a shoshonite rock association. Crystallization path calculations and petrographic observations suggest that the wide compositional variation was brought mainly by amphibole- and plagioclase-dominated fractionation of a gabbroic magma with minor fractionation of clinopyroxene, biotite and potash feldspar. This fractionation occurred at a comparatively shallow crustal level, deeper than 2kb, before upward migration. The granitic rocks characterized by an abundance of amphibole (up to 39%) and a scarcity of biotite (less than 4%) were formed at a higher P H2O and lower temperature than early-crystallized gabbros. The close association of clinopyroxene- and biotite-rich gabbro, whose clinopyroxene and plagioclase often show reverse zoning in the Mg/(Mg+Fe*) ratio and An content, with amphibole-rich gabbro suggests that P H2O had increased rapidly during crystallization of the gabbroic melt. The intrusion of H2O-saturated granodioritic melt to the gabbroic melt may have caused the rapid increase of P H2O.","PeriodicalId":22709,"journal":{"name":"The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1987-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76089206","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Petrological study on the Konoyama gabbroic body in the Ryoke belt, Kinki district, Japan 日本近畿地区良带小山辉长岩的岩石学研究

The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists Pub Date : 1987-11-05 DOI: 10.2465/GANKO1941.82.401

Y. Tainosho

引用次数: 0

Rb-Sr whole rock age of granitic rocks from the Sanyo zone in the central Hiroshima Prefecture 广岛市中部三洋地区花岗质岩石的Rb-Sr全岩年龄

The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists Pub Date : 1987-11-05 DOI: 10.2465/GANKO1941.82.395

T. Nakajima, T. Shirahase

引用次数: 7

Determination of trace elements in rock samples by X-ray fluorescence 岩石样品中微量元素的x射线荧光测定

The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists Pub Date : 1987-11-05 DOI: 10.2465/GANKO1941.82.411

H. Fujimaki, K. Aoki

引用次数: 13

Radio-metric ages of some Cenozoic volcanic rocks from Ryukyu Islands 琉球群岛新生代火山岩的放射性年龄

The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists Pub Date : 1987-10-05 DOI: 10.2465/GANKO1941.82.370

M. Daishi, M. Hayashi, Y. Kato

{"title":"Radio-metric ages of some Cenozoic volcanic rocks from Ryukyu Islands","authors":"M. Daishi, M. Hayashi, Y. Kato","doi":"10.2465/GANKO1941.82.370","DOIUrl":"https://doi.org/10.2465/GANKO1941.82.370","url":null,"abstract":"The radio-metric ages on 13 volcanic rocks from the Ryukyu Islands have been measured by one of fission track methods (viz. arranged fixed area population method, external-surface external-detecter method and external-surface internal-detecter method) or K-Ar method. The ages obtained are as follows: Takarajima propylite/1.4±0.4Ma (KAG-001), 5.05±0.38Ma (KAG-002), and 1.1±0.3Ma (KAG-003); Tairajima andesite/4.79±0.96Ma (KAG-004); Suwanosejima andesite/0.64±0.16Ma (KAG-006); Nakanoshima andesite/1.75±0.22Ma (KAG-008), and 0.14±0.06Ma (KAG-009); Okinawajima andesite/16.6±1.4Ma (OKA-011); Agunijimadacite/6.24±0.46 (OKA-021); Kumejima andesite/12.8±2.1Ma (OKA-023), and 15.1±2.6Ma (OKA-024); Ishigakijima rhyolite/44.1±1.8Ma (OKA-033), and 43.5±1.8Ma (OKA-035). Of these, two samples of KAG-001 and KAG-003 were measured by the whole-rock K-Ar method. The age determination has resulted in the recognition of four stages of volcanism in the Ryukyu Islands: middle Eocene Green-Tuff, middle to late Miocene Green-Tuff, late Miocene to early Pleistocene Older-Volcanic Islands, and early Pleistocene to Recent Younger-Volcanic Islands.","PeriodicalId":22709,"journal":{"name":"The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1987-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85658047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Fluid inclusion study on the Itaga tungsten deposit, Ashio district, Japan 日本鹿尾地区Itaga钨矿床流体包裹体研究

The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists Pub Date : 1987-10-05 DOI: 10.2465/GANKO1941.82.353

Y. Shibue

{"title":"Fluid inclusion study on the Itaga tungsten deposit, Ashio district, Japan","authors":"Y. Shibue","doi":"10.2465/GANKO1941.82.353","DOIUrl":"https://doi.org/10.2465/GANKO1941.82.353","url":null,"abstract":"Fluid inclusion study on the Itaga tungsten deposit is carried out in order to characterize the hydrothermal solution responsible for this deposit. Polyphase fluid inclusions and vapor-rich ones as well as liquid-rich inclusions are found in quartz of the disseminated ore in the Itaga granite. Vapor-rich and liquid-rich inclusions are found in vein quartz, scheelite, and topaz from this deposit, but polyphase inclusions are not found in these minerals. Homogenization temperatures of primary fluid inclusions in quartz of the disseminated ore, vein quartz, scheelite, and topaz range from 518° to 261°C, from 388° to 265°C, from 336° to 301°C, and from 420° to 370°C, respectively. Salinities of primary fluid inclusions in quartz of the disseminated ore, vein quartz, scheelite, and topaz range from 45.1 to 0.9, from 21.0 to 8.3, from 7.9 to 5.3, and from 14.3 to 3.1 NaCl eq. wt%, respectively. The highest temperature and salinity reported in the present study are higher than any other data previously obtained for the Japanese tungsten deposits. Based on the plots of homogenization temperature against salinity, it is suggested that there were at least two hydrothermal solutions, i.e., very saline and dilute ones, responsible for the mineralization of the Itaea deoosit.","PeriodicalId":22709,"journal":{"name":"The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1987-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88650461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Thermal Effect of Granite Pluton on Graphitization of Carbonaceous Material in the Kuga Group, Southwest Japan 日本西南部Kuga群花岗岩岩体对碳质物质石墨化的热效应

The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists Pub Date : 1987-10-05 DOI: 10.2465/GANKO1941.82.362

N. Tsuchiya, Shunichi Suzuki, Yukito Oda

引用次数: 3

Neogene volcanic rocks of the eastern part of the Koma Mountain, Yamanashi Prefecture 山梨县科马山东部新近纪火山岩

The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists Pub Date : 1987-10-05 DOI: 10.2465/GANKO1941.82.382

M. Shimazu, Itsuo Ishimaru

{"title":"Neogene volcanic rocks of the eastern part of the Koma Mountain, Yamanashi Prefecture","authors":"M. Shimazu, Itsuo Ishimaru","doi":"10.2465/GANKO1941.82.382","DOIUrl":"https://doi.org/10.2465/GANKO1941.82.382","url":null,"abstract":"The Kushigatayama Subgroup, Kurosawa basalt-mudstone and Tsukimibashi andesite of the Nishiyatsushiro Group of middle Miocene are distributed in the eastern part of the Koma mountain and are composed of basaltic and andesitic lavas and pyroclastic rocks and small amounts of mudstones and acid tuffs. Most of the volcanic rocks were altered to low-grademetamorphic rocks ranging from laumontite to prehnite-pumpellyite facies. Volcanic rocks of the Kushigatayama Subgroup are composed of olivine basalt, diopsideolivine basalt, diopside-augite basalt, augite andesite, hypersthene-augite andesite and augitehornblende andesite. Almost of olivine phenocrysts are altered to saponite or chlorite/saponite mixed layered mineral. Phenocryst clinopyroxenes are diopside, endiopside, salite and augite and groundmass clinopyroxenes range augite through subcalcic augite to pigeonite. Mafic phenocryst content is 38.8 percent in maximum. Abnormal phenocryst content results from the presence ofmegacryst or cumulate. Most of volcanic rocks may belong to tholeiite series. Basalts having FeO*/MgO ratios(0.91-1.00) are very close to the primitive basalt in composition, although some basalts include cumulates. Differentiation from olivine basalt to andesite is mainly interpreted by fractionation of olivine, clinopyroxene and plagioclase. From whole rock chemical compositions, P2O5/MnO/TiO2 ratios in Mullen's diagram and chondrite-normalized REE concentration, basalts of this area as well as those of the Misaka and Tanzawa areas are obvious to be island arc tholeiite.","PeriodicalId":22709,"journal":{"name":"The Journal of the Japanese Association of Mineralogists,Petrologists and Economic Geologists","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1987-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91216452","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2